Pet bed



FIG. 1 is a perspective view taken from the top, front and right side of a pet bed embodying my new design;

FIG. 2 is a front elevational view thereof, the rear being the same as the front shown;

FIG. 3 is a right side elevational view thereof, the left side being the same as the right side shown; and

FIG. 4 is a top plan view thereof. 

The ornamental design for a pet bed, as shown and described. 